[Resolved] Display 640 x 480 pic rather than album cover

Hello! I must warn you that I am very inexperienced with wordpress. My widget displays the album cover with a thumbnail, that you click to pull up a larger image, and then have the option to start a slideshow. I would prefer if the widget would automatically display the most recent ‘photo of the day’ image in the full size version, rather than the album cover/thumbnail. Please answer me as if I’ve never done this before, because I haven’t. Thank you very much in advance!